Rotary pump



U ITED STAW GEO. W. GRISWOLD, OF GARBONDALE, PENNSYLVANIA.

ROTARY PUMP.

To all whom t may concern Be it known that I, GEORGE IV. GRISwoLD, ofCarbondale, in the county of Luzerne, andState of Pennsylvania, haveinvented certain new and useful Improvements in Rotary Pumps; and I dohereby declare the following to be a full, clear, and exact descriptionof the same, reference being had to the accompanying drawings, making apart of this specification, in which- Figure l, represents a sectionthrough the pump vertically. Fig. 2, represents a horizontal sectionthrough the line fr, and Fig. 3 a cross section at the line y, of Fig.l.

Similar letters of reference where they occur in the several figuresdenote like parts of the pump in all of them.

The nature of my invention relates more especially to the arrangement ofthe eccentrics within the drum or cylinder, and to the manner ofoperating the cut-offs in connection with said eccentricsby which meansI make a very simple, cheap, and efcient pump.

To enable others skilled in the art to make and use my invention, I willproceed to describe the same with reference to the draw- 1n s.

IA, represents a drum or cylinder, which is entirely closed, except tothe induction and eduction passages, as will be explained. Within thisdrum or cylinder are placed the eccentrics B, B, which are divided by adisk or plate a, and upon the outside of these eccentrics are placeddisks, or plates c, c, which three platesror disks are concentric, andof the same diameter, as that of the inside of the drum or cylinder A.

The two eccentrics B, B, are placed diametrically opposite to each otheron the shaft eL-that is to say, so that the greatest throw or swell onthe one, shall be diametrically opposite the lowest depression of theother eccentric, as seen in Figs. l, 2. These two eccentrics, with theirdisks or plates a, 0, may all be cast or wrought in one piece, and thisone piece, constitutes the whole interior of the drum or cylinder whichit should snugly fill. As there is no part of the eccentrics liable toderangement, the drum need never be opened, after once properly puttogether.

D, D, are two cut-o-Hs one for each eccentric. These cut-offs areoperated by the eccentrics themselvesone eccentric keeping the cut-offof its fellow eccentric in action. The cut-ois operate in concert witheach other, and with their eccentrics, through the series of rollers orsmall cylindrical pieces e, e, e, &c., extending from one to the other,said pieces being all separate, and rolling one against the other, sothat as one eccentric pushes out its cutwoff, that cut off pushes in itsfellow, and of course these cut-offs, must conform to the exactperipheries of the eccentrics, as the eccentrics themselves work them.The rollers e, e, extend around in the circular ways f f, and as agreater nulnber of them get into the straight line, they will be longerthan when in the curve, this requires some compensation to equalize thedifference. I do this by the introduction of a helical spring z', at oneor both ends of the series, which yields to the lengthening orshortening of said series of rollers. Over these rollers, is a man hole,E through which they can be repaired, as well as the cut-offs, shouldthey become disarranged in any manner. This man-hole or opening iscovered by a cover F, with glass in it through which the operative partsmay be clearly seen.

G, is the pipe or tube through which the water is drawn up, it having afoot valve 7L, in it. This pipe or tube is single up to the point H,from thence it is double, and each passage covered by a clack valve g,g, as seen in Fig. 3. The object of the double passages is that, eacheccentric shall operate its own column of waterthe two columns beingunited at the eduction passage I. The points of contact between theeccentrics and drum, being directly opposite to each other, it isobvious that as one eccentric diminishes its column of water, the otheris enlarging its column, and vice versa, and., thus the column is alwaysuniform in volume.

The eccentrics and their flanges or disks, moving with the column ofwater, produce but little friction, hence the pump is easily worked. pInstead of there being a single throw to each of the eccentrics, theremay be two or more to each. The pump is operated by turning the handle Jand the column of water thrown out by it, is uniform in volume, anddelivered with great ease to the operator.

Having thus fully described the nature of my invention I would statethat, I am aware that two separate eccentrics, with a fixed orstationary partition between them, have .been used in a pump cylinder;this I do not manner, and for the purpose herein setclaim but forth.

What I do claim herein as new and desire to secure by Letters Patentis*7 G' W' GRISWOLD' 5 The double eccentrcs, With their disks erWitnesses:

A. B. STOUGHTON, H. A. CHAMBERS.

plates formed in one piece When operating n a drum 0r cylindersubstantially n the

